Construction cost per square meter for color change of black asphalt pavement

Construction Price per Square Meter for Black Asphalt Pavement Color Change

Performance Characteristics of Colored Spray Coating:

1. Aesthetic Color: The sprayed surface does not adhere to dust or particles. The entire binder system offers high strength and wear resistance, ensuring long-lasting color retention and aesthetics. It is oil-resistant, waterproof, UV-resistant, and suitable for long-term outdoor durability.

2. Wide Application Range: Suitable for color restoration of colored asphalt pavements, as well as color change and beautification of cement, asphalt concrete roads, and various pedestrian pavements in any color.

3. Simple Construction Process and Quick Traffic Opening: Compared to colored anti-skid paving, the construction process is simpler and more cost-effective. The seal coat offers brighter, more vibrant, and durable colors, with better adhesion, strength, weather resistance, and wear resistance compared to the original surface. Conventional spraying techniques can be applied directly to stable asphalt pavements, cement concrete, and pedestrian pavement surfaces. Each kilogram can cover 2–3 square meters, enabling rapid completion of large-area paving. A single spraying device can cover over 1,000 square meters per day, with fast curing in 1 hour. Traffic can be opened 2 hours after construction.

4. Long Service Life: Its main component is a high-molecular inorganic composite material, which significantly outperforms common epoxy resin systems in terms of weather resistance, toughness, adhesion, and plasticity. One-time spraying can maintain color for 3–5 years without fading.

5. Economical and Eco-Friendly: Low cost, environmentally friendly materials, and no pungent odor.

6. Minimal Impact from Construction Environment: Can be applied quickly at room temperature using a spray painting machine, making construction simple and convenient. The surface appearance is improved, and the color is more durable. Even low temperatures do not hinder construction: it performs well in cold conditions and can be applied normally at temperatures as low as -30°C.

III. Application Scope of Colored Spray Coating:

Road color change, landscape roads, colored pavement restoration.

Colored pavement spraying is a highly advanced road material widely used on various highways, pedestrian overpasses, non-motorized vehicle lanes, urban slow-traffic lanes, sidewalks, crosswalks, garden squares, factory and warehouse areas, school campuses, residential areas, parking lots, underground garages, stairways, and more.

IV. Construction Steps for Colored Spraying Machine: Pre-Construction Base Treatment

1. New black asphalt surfaces require fine-grained asphalt leveling, compaction, and cooling.

2. Old asphalt pavements need repair, cleaning, and primer treatment before spraying.

3. Before construction, ensure the availability of water and electricity, traffic access, mixing and storage areas, temporary sheds, warehouses, and fire safety facilities.

4. Pay attention to environmental protection during construction.

Pavement Construction

1. Mix materials thoroughly according to the required ratio.

2. Apply masking tape as per road design requirements to prevent contamination.

3. Mix modified polymer emulsion with colored powder in proportion using a high-speed mixer for 3 minutes, let stand for 3 minutes, then mix for another 2 minutes before use.

4. Pour the mixed material into the spraying container. Stir while spraying.

5. After the polymer coating dries (2–4 hours), spray the colored surface layer.

6. After construction, allow 1–2 days for curing and cleaning before opening to traffic.

V. Key Considerations for Colored Pavement Spray Coating Construction:

1. Newly paved asphalt surfaces have not undergone the elastic kneading action of vehicle tires, so the asphalt in the mixture may not fully bleed, leaving larger voids. During spraying, the color-changing agent may penetrate these voids and react slightly with free asphalt.

2. For newly paved asphalt surfaces, color change construction should be performed at least 1 week after opening to traffic. If the schedule is tight, within 2 days after paving and under clear weather conditions, use a tire roller to repeatedly compact and knead the new pavement to improve asphalt bleeding before color change construction. If yellowing occurs during spraying, increase the distance between the spray nozzle and the pavement or adjust the sprayer pressure to 6 MPa. Spray at a 45-degree angle to the pavement (this method reduces the penetration of the color-changing agent into asphalt particles, preventing complete encapsulation of aggregate particles and loss of the oil film). For non-new pavements, the pressure should be 8 MPa, still at a 45-degree angle.

3. For white primer spraying on asphalt pavement, maintain a distance of 40–1250 px between the spray nozzle and the ground. Apply two coats with an interval of at least 40 minutes between coats.

4. Colored topcoat spraying should be performed after the primer has fully cured. Generally, apply two coats with an interval of at least 40 minutes between coats.